I have a rough patch on my buttocks.

There isn't sufficient information to give you a specific diagnosis but it is likely to be tinea cruris. It's caused by a type of fungus called dermatophytes. It grows in a circle on your skin and often looks like a ring. Due to irritation, the skin becomes red. Some people think the infection looks like there is a worm under the skin. Because of this, this infection is often referred to as "ringworm," although no worm is actually involved. The fungi are commonly found on the skin surface and nails and are usually quite harmless. Under certain conditions, however, they can multiply dramatically, causing irritation and surface tissue damage. You will require an antifungal tablet, antihistamine and a topical antifungal cream. The following steps may help: - Do not wear tight clothing. - Change undergarments regularly - Wear breathable fabrics such as cotton to decrease the sweating. - Keep areas where there is sweat accumulation dry regularly and apply powder in those areas to reduce the moisture. If the problem is persistent I would advise you to meet a dermatologist.

Follow the steps as advised

If condition persists or worsens visit the dermatologist at the earliest