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Dermoscopic findings in scalp psoriasis and seborrheic dermatitis; two new signs; signet ring vessel and hidden hair.

Kibar M, Aktan Ş, Bilgin M - Indian J Dermatol (2015 Jan-Feb)

Bottom Line: Trichoscopic examinations were performed using a videodermatoscope (MoleMax 3(®)).Trichoscopic findings of scalp psoriasis and seborrheic dermatitis were compared with each other, with 100 healthy individuals and with other noncicatricial alopecias including female androgenetic alopecia (FAGA) (n: 138), male androgenetic alopecia (n: 63), FAGA of male pattern (FAGA.M) (n: 5), alopecia areata (39), TE (n: 22) and trichotillomania (n: 4).In comparison with previous reports, our study yielded two new trichoscopic structures supporting the diagnosis of psoriasis; HH and SRV.

View Article: PubMed Central - PubMed

Affiliation: Department of Dermatology, Muş Bulanık Government Hospital, Muş, Turkey.

ABSTRACT

Background: Psoriasis and seborrheic dermatitis are both chronic erythemato-squamous dermatoses that can involve the scalp. It may be difficult to differentiate these two diseases when there is isolated scalp involvement. Recently, trichoscopy is commonly used to differentiate noncicatricial alopecias including psoriasis and seborrheic dermatitis that can lead to telogen effluvium (TE).

Objectives: The objective of this study is to evaluate the trichoscopic figures that may help to differentiate scalp psoriasis and seborrheic dermatitis.

Materials and methods: Thirty one with scalp psoriasis and 112 patients with seborrheic dermatitis were enrolled. Trichoscopic examinations were performed using a videodermatoscope (MoleMax 3(®)). Trichoscopic findings of scalp psoriasis and seborrheic dermatitis were compared with each other, with 100 healthy individuals and with other noncicatricial alopecias including female androgenetic alopecia (FAGA) (n: 138), male androgenetic alopecia (n: 63), FAGA of male pattern (FAGA.M) (n: 5), alopecia areata (39), TE (n: 22) and trichotillomania (n: 4).

Results: Atypical red vessels, red dots and globules (RDG), signet ring vessels (SRV), structureless red areas and hidden hairs (HH) were statistically more common in psoriasis while twisted red loops and comma vessels (CV) in seborrheic dermatitis. RDG were considered as the characteristic videodermatoscopic figure for psoriasis and arborizing red lines and CV for seborrheic dermatitis. In comparison with previous reports, our study yielded two new trichoscopic structures supporting the diagnosis of psoriasis; HH and SRV. Besides, according to our study, CV were described for the first time in seborrheic dermatitis and considered to be specific for seborrheic dermatitis.

Conclusion: This study confirmed that trichoscopy might be useful in differentiating scalp psoriasis and seborrheic dermatitis from each other and from other noncicatricial alopecia with three trichoscopic structures as HH, SRV and CV.

No MeSH data available.


Related in: MedlinePlus

Comma vessels in three different patients with seborrheic dermatitis (×100 magnification)
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Figure 3: Comma vessels in three different patients with seborrheic dermatitis (×100 magnification)

Mentions: In seborrheic dermatitis during the chronic phase there is marked psoriasiform hyperplasia with dilatation of the capillaries and venules of the superficial plexus, which makes it very similar to psoriasis except for the spongiosis.[1315] Although this plexus was characterized as arborizing lines and ARV by trichoscopy during previous reports,[9] we detected some of them as comma shaped vessels in our study [Figure 3]. CV was observed only in seborrheic dermatitis when compared with other alopecias including psoriasis so we considered this sign as specific for seborrheic dermatitis.


Dermoscopic findings in scalp psoriasis and seborrheic dermatitis; two new signs; signet ring vessel and hidden hair.

Kibar M, Aktan Ş, Bilgin M - Indian J Dermatol (2015 Jan-Feb)

Comma vessels in three different patients with seborrheic dermatitis (×100 magnification)
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4318061&req=5

Figure 3: Comma vessels in three different patients with seborrheic dermatitis (×100 magnification)
Mentions: In seborrheic dermatitis during the chronic phase there is marked psoriasiform hyperplasia with dilatation of the capillaries and venules of the superficial plexus, which makes it very similar to psoriasis except for the spongiosis.[1315] Although this plexus was characterized as arborizing lines and ARV by trichoscopy during previous reports,[9] we detected some of them as comma shaped vessels in our study [Figure 3]. CV was observed only in seborrheic dermatitis when compared with other alopecias including psoriasis so we considered this sign as specific for seborrheic dermatitis.

Bottom Line: Trichoscopic examinations were performed using a videodermatoscope (MoleMax 3(®)).Trichoscopic findings of scalp psoriasis and seborrheic dermatitis were compared with each other, with 100 healthy individuals and with other noncicatricial alopecias including female androgenetic alopecia (FAGA) (n: 138), male androgenetic alopecia (n: 63), FAGA of male pattern (FAGA.M) (n: 5), alopecia areata (39), TE (n: 22) and trichotillomania (n: 4).In comparison with previous reports, our study yielded two new trichoscopic structures supporting the diagnosis of psoriasis; HH and SRV.

View Article: PubMed Central - PubMed

Affiliation: Department of Dermatology, Muş Bulanık Government Hospital, Muş, Turkey.

ABSTRACT

Background: Psoriasis and seborrheic dermatitis are both chronic erythemato-squamous dermatoses that can involve the scalp. It may be difficult to differentiate these two diseases when there is isolated scalp involvement. Recently, trichoscopy is commonly used to differentiate noncicatricial alopecias including psoriasis and seborrheic dermatitis that can lead to telogen effluvium (TE).

Objectives: The objective of this study is to evaluate the trichoscopic figures that may help to differentiate scalp psoriasis and seborrheic dermatitis.

Materials and methods: Thirty one with scalp psoriasis and 112 patients with seborrheic dermatitis were enrolled. Trichoscopic examinations were performed using a videodermatoscope (MoleMax 3(®)). Trichoscopic findings of scalp psoriasis and seborrheic dermatitis were compared with each other, with 100 healthy individuals and with other noncicatricial alopecias including female androgenetic alopecia (FAGA) (n: 138), male androgenetic alopecia (n: 63), FAGA of male pattern (FAGA.M) (n: 5), alopecia areata (39), TE (n: 22) and trichotillomania (n: 4).

Results: Atypical red vessels, red dots and globules (RDG), signet ring vessels (SRV), structureless red areas and hidden hairs (HH) were statistically more common in psoriasis while twisted red loops and comma vessels (CV) in seborrheic dermatitis. RDG were considered as the characteristic videodermatoscopic figure for psoriasis and arborizing red lines and CV for seborrheic dermatitis. In comparison with previous reports, our study yielded two new trichoscopic structures supporting the diagnosis of psoriasis; HH and SRV. Besides, according to our study, CV were described for the first time in seborrheic dermatitis and considered to be specific for seborrheic dermatitis.

Conclusion: This study confirmed that trichoscopy might be useful in differentiating scalp psoriasis and seborrheic dermatitis from each other and from other noncicatricial alopecia with three trichoscopic structures as HH, SRV and CV.

No MeSH data available.


Related in: MedlinePlus