How can I treat oily skin with pimples?

Tinea versicolor can be treated with antifungal creams. Please apply it to the affected area twice a day for 2 weeks. If you don't see any improvement, please try oral antifungal. Also, keep the area dry and clean and avoid wearing tight clothes as this can make the affected area sweaty. If the problem does not go away still, please consult a doctor for the same. 

For fine lines around eyes: We first need to ascertain whether it is a static or a dynamic wrinkle. For static wrinkle, retinol-based creams or serums and polyhydroxy acids creams will do the job. And for Dynamic wrinkle, the only treatment option is Botulinum Toxin(BOTOX) Injections. Black heads, above creams will take care of the problem, if not then lasers might be required.

The contact dermatitis can last a long time. It depends upon the nature, frequency and duration of the exposure to the allergens. If the exposure to the allergens continues it might take very long time. If the exposure to the allergens is stopped then it will be recovered quickly.

Nightfall or wet dreams are common and normal phenomena for unmarried young people. It occurs precisely because your body is generating hormones. Having it happen twice a month can't be a cause for alarm most of the time. To minimize the frequency of such occurrences, avoid stimulating activities before bed, keep yourself busy during the day, and maintain a healthy lifestyle with regular exercise and a balanced diet.