Ist der weiße Fleck auf der Hand des Sohnes Vitiligo?

I can see that scratching you due to a street dog can be a worrying issue for you. From your information, the scratch is not too deep, which may mean there is a low chance of infection. Watch out for any redness, swelling, or warmth around the area. First of all, wash the scratch using soap and water and then apply the antiseptic cream to the area to avoid any further infection. Watch the scratch for a few days, and if you spot any of the infection signs that are getting worse, like more pain, redness, or pus formation, it is better to go to a doctor. 

Ringworm is a cutaneous infection which a fungus causes. Symptoms such as red, itchy, and scaly spots that look like circles may occur on the skin. The ringworm can be transmitted through contact with infected people, pets, or objects like shared towels. Therapy involves antifungal creams or tablets. You can also prevent the spreading of the infection by keeping the area clean and dry.

Acne on the forehead is commonly caused by oily skin. Symptoms of the condition are seen in the form of pimples and redness. The reason for this is usually the presence of acid, bacteria, and the clogging of pores. You can help by washing your, face daily with a gentle cleanser, keeping your hands away from your, face, and using non-comedogenic products.

There are a few treatment options available for black spots on the face. The most common and effective treatments are chemical peels, laser treatments, and topical creams. Depending on the severity of the spots and the desired results, the cost can vary widely. It's best to consult a dermatologist to determine which treatment is best for you.

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.