Skin melanin treatment surgery can be harmful in the long run so I suggest not to go for it. You can try other treatments like chemical peels or dermabrasion instead. These treatments can help lighten the skin and are not harmful in the long run. Also using moisturizer and sunscreen can help.

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. 

The sexually transmitted infection, human papillomavirus causes genital warts. Although certain individuals can be born with a genetic inclination to get warts, it is usually found through sexual intercourse. Genital warts must be diagnosed and treated by a dermatologist or the specialist in STDs to do it properly.

Your scalp problem could be a medical issue that requires medical treatment. I recommend you should pay a visit to a dermatologist, who is a skin expert. They can detect the condition and recommend the medications or treatment option that should be taken. Avoid using any harsh chemicals on your scalp until you have been to a doctor.
 

You may be suffering from allergies, which can cause sneezing and chills despite warm weather. Allergens such as dust and strong odors, possibly from food, could trigger these symptoms. To manage this, avoid exposure to dust and pungent smells. Wearing a mask and keeping your living areas spotless can help. Over-the-counter antihistamines may offer relief. However, allergies are a complex condition, so it's important to steer clear of irritants.