You have a fungus infection of the head of the penis. Fungal infections occur in hot, moist areas. The signs of redness, itching as well as an unusual discharge. To get rid of it, the area should be kept clean and dry, loose clothing should be worn and antifungal cream should be used.

When dry, dark skin fe­els tight or rough, itchiness happens some­times. This dryness arises due­ to cold air, harsh soaps, and lack of water. Find skin creams containing shea butte­r or glycerin to keep skin soft and hydrate­d. Hyaluronic acid also helps. Use sunscree­n always and drink lots of water. Hot showers damage by stripping natural oils away from the skin. So the­y're best avoided.

Warts on the fingers may be caused by this virus named HPV that gets into the skin through cuts or breaks in. Warts are raised lumps that sometimes have tiny black dots. To treat them you can try over-the-counter wart treatments or get a doctor's prescription. Wash your hands often and dry them well to avoid contamination of others with warts.

Oral herpes can be spread through sharing drinks or cigarettes, even when no sores are visible. Symptoms might include tingling, itching, or blisters on or around the lips. There is no cure for herpes; however, antiviral drugs can help control outbreaks. Don't forget to follow safe practices to protect yourself from such infections in the future.

The little bumps under your tongue that appear and disappear might be swollen taste buds, which don’t pose any danger. Conversely, oral thrush is a result of yeast infection. This is quite widespread and can be cured with antifungal drugs that should be prescribed by a physician. Do not forget to brush your teeth regularly and to follow a balanced diet.

Sometimes not having enough vitamin D3 can cause people to lose their hair. You should keep taking the vitamin D supplement as the doctor told you. You should try to eat more foods that have iron and protein in them as well. One thing that might help is finding ways to relax when you are stressed. 

The burning or pain you might be feeling is from the drugs you are using. To relieve the discomfort, you can use a mild soothing cream such as Vaseline or aloe vera gel which will help to ease the irritation and give some relief. Ensure that the region is kept dry and clean to quicken the healing process.