Hello,
Your symptoms are suggestive of tinea versicolor. Tinea versicolor is caused by a fungus that lives in the skin of almost all adults. Factors that can cause the fungus to become more visible include high humidity and immune or hormone abnormalities. Treatment involves topical and oral antifungal medicines.
Most cases of fungal infection respond to over-the-counter products, which contain any of several basic ingredients: miconazole, tolnaftate, terbinafine,ketaconazole and clotrimazole. You can consult a pharmacist and get any cream or lotion containing these ingredients. Some of them are Lamisil, Monistat derm, Mycelex, and Nizoral.
If the symptoms persist then please get it evaluated from a dermatologist. Psoriasis has to be ruled out.
Hope it helps. Take care and please do keep me posted on how you are doing or if you have any additional queries. Kind regards.
By the way none of these patches are raised and sometimes fade in color but never go away.