TLDR Two new signs, 'signet ring vessels' and 'hidden hairs,' help tell apart scalp psoriasis and seborrheic dermatitis.
In 2015, a study involving 31 patients with scalp psoriasis and 112 patients with seborrheic dermatitis was conducted to identify trichoscopic figures that could differentiate between the two conditions. The study found that 'signet ring vessels' and 'hidden hairs' were more common in psoriasis, while 'twisted red loops' and 'comma vessels' were more common in seborrheic dermatitis. These findings introduced two new trichoscopic structures supporting the diagnosis of psoriasis and described 'comma vessels' for the first time in seborrheic dermatitis. The study concluded that trichoscopy could be useful in differentiating scalp psoriasis and seborrheic dermatitis from each other and from other noncicatricial alopecia.
89 citations,
December 2010 in “The Journal of Dermatology” The conclusion is that an algorithm using trichoscopy helps diagnose different types of hair loss but may need updates and a biopsy if results are unclear.
111 citations,
November 2007 in “Clinics in Dermatology” Psoriasis skin changes are complex and might need several biopsies for a clear diagnosis.
304 citations,
July 2006 in “Journal of The American Academy of Dermatology” Videodermoscopy improves diagnosis of hair and scalp disorders and may reduce scalp biopsies.
128 citations,
January 2001 in “American Journal of Clinical Dermatology” Coal tar shampoos, salicylic acid, and topical corticosteroids are effective for scalp psoriasis, with Vitamin D3 analogues also showing benefits; severe cases may require stronger medication with more risks.
1 citations,
January 2022 in “Dermatology Reports” Many people with hair loss, especially those with telogen effluvium and alopecia areata, often have a sensitive scalp.
6 citations,
January 2019 in “Indian Journal of Dermatology” About 12% of children in Kota, Rajasthan, experience hair loss, mainly due to fungal infections, with early treatment advised to prevent worsening.
40 citations,
December 2014 in “Indian Journal of Dermatology” Two new signs, 'signet ring vessels' and 'hidden hairs,' help tell apart scalp psoriasis and seborrheic dermatitis.
The woman has unexplained hair loss and it's unclear what her condition is or how to treat it.
304 citations,
July 2006 in “Journal of The American Academy of Dermatology” Videodermoscopy improves diagnosis of hair and scalp disorders and may reduce scalp biopsies.
