The burning and irritation after applying Derobin ointment are likely due to a reaction to the medication, as it contains strong ingredients that are not suitable for sensitive areas like the inner thighs, so you should stop using it immediately. Gently clean the area with water, keep it dry, and apply a soothing moisturiser or calamine lotion to reduce irritation; avoid tight clothing and wear loose cotton underwear to prevent further friction. Do not apply any steroid or medicated creams without medical advice, as they can worsen the problem. If redness, pain, or burning persists, or if there are signs of infection like discharge or spreading rash, it is important to consult a doctor for proper treatment and a safer alternative.

You should consult your doctor to get a prescription for topical steroids or vitamin D analogues, which can help reduce inflammation and slow skin cell buildup. Apply fragrance-free emollients or moisturisers daily to keep your skin hydrated. It is also essential to identify and avoid known triggers such as stress, smoking, alcohol, or harsh soaps, as these may worsen psoriasis and cause flare-ups. Regular skin care and adherence to your treatment plan can help manage symptoms effectively.

Derobin ointment is not safe or appropriate for treating small, round, white patches on the skin, as it contains ingredients meant for specific conditions such as psoriasis, and using it without proper diagnosis can irritate the skin, cause side effects, or worsen the condition. White patches can have different causes, such as fungal infection, vitiligo, or post-inflammatory changes, and each requires a different treatment. It is best to avoid self-medication and consult a doctor for a correct diagnosis and appropriate treatment, which may include antifungal creams or other targeted therapies depending on the cause.