question: Hello doctor. I am a 35-year-old male with moderate obesity. I do not have any chronic ailments like diabetes, BP, etc. The skin on my inner groins (slightly close to the gluteal folds) has become dark over the years and due to constant friction between the inner thighs has developed dryness and cracked or scaly like (appear to be fissured) and is causing a lot of discomforts. I have tried applying lubricant creams and anti-fungal ointments, but they do not seem to help. Since about a year ago I developed scalp psoriasis and fingers or nails psoriasis, I thought it could be the same on these areas of friction too. And tried applying Tacrolimus. Again it is not helping. Please advise.