[Skin Concerns] Non-Itchy Red Rash on Scalp/Neck - at wit's end.

Beauty Tips For Body Care
So I've had this rash on the back of my scalp for over a year now. It's not really itchy, tender or dry. It feels like fairly normal skin (smooth), though the area can get sensitive at times.My current skincare & shaving routine:Wash with La Roche Toleriane Cleanser (Face + Scalp)Shave my head with Tabac or Valobra Shaving Soap using a Merkur 37c Slant Razor and Astra Blades.Apply BHA Liquid 2% to Face + Scalp + NeckAfter around 20 minutes I apply La Roche Toleriane Fluid Moisturizer to Face + Scalp + Neck.I should add, that I also take 5mg accutane / day to help with excessive sebum production and a mild acne. Very successfully, I might add. My dermatologist is pretty awesome, though he can't really pinpoint what that rash is (as the symptoms are almost non existant) - atm we are trying topical Ketoconazole in form of a shampoo (on day 3 now) to see if it could be some sort of Tinea Versicolor. So now that my sebum production and my mild acne is fairly controlled - I want to get rid of this (mostly cosmetic) rash aswell. Oh yeah, I switch my pillowcase every night (has become a habit).Yet, I still wanted to ask around here, as I know that there are a ton of knowledgable users here who might shed some light onto the issue that I then can take to my derm.What I (we) also tried specifically for that areaSelsun Blue Shampoo & Ciclopiroxolamin Shampoos.Topical ClindamycinNot wet-shaving the head (just trimming) for several weeks - e.g. eliminating possible allergic reactions. Having said that, I've been shaving my head for several years with the same products and that rash only became really visible in the past 1-2 years.Current: Topical Ketoconazol (Shampoo) for 4-5 Minutes - 7 days straight, then once per week.So any other insights and/or suggestions would be greatly appreciated.Thank you, SCA.
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Submitted by sukhostavskaya