Fungal infections can lead to an itchy rash in the vaginal and thigh area. The warm and humid climate is an ideal growth environment for fungi. Keep the area dry and clean. You can use antifungal creams available over the counter to help clear it up. Moreover, wearing loose and breathable clothes is also important. 

This can be treated with either topical creams or laser treatments. Depending on the severity of your condition, it is best to consult a dermatologist to determine the best treatment for you. Laser treatments are often more effective than topical creams, but a bit expensive. Topical creams can be used to reduce the appearance of the bumps but may not completely remove them.

Premature gray hair occurs when your hair loses its natural color earlier than expected, often before the age of 30. You may notice gray hair becoming more common or see more gray strands than usual. The main cause is usually genetics, but factors like stress, poor diet, and certain medical conditions can also contribute. Maintaining a balanced diet, managing stress, and using hair products with vitamins can help support hair health and slow the graying process.

Psoriasis can be a bit challenging to treat but various treatments like medications, laser treatments, alternative treatments like homeopathy etc., avoiding triggers that worsen your psoriasis symptoms can prove useful. I suggest talking to your doctor for proper examination of your condition which will help in deciding which is the best treatment for your condition.