What should I do for minor street dog scratch?

Your skin might be affected by acanthosis nigricans which is identified by dark patches, even on the throat and joints. Being overweight and having high blood pressure are risk factors for this. The treatment is to lose weight and control the BP, as a result, the patches can be healed. Follow a healthy diet, exercise regularly, and be consistent with your prescribed medications to control your blood pressure.

As a vegetarian, if you want to include Omega-3 fatty acids in your diet, you should not use fish oil. What is in fish oil mainly comes from fish, and many people may find this unappealing. Instead, consider using flaxseed oil or algae oil which are obtained from plants. The two oils have similar benefits as fish oil but do not contradict with the vegetarian lifestyle.

You expe­rienced an unwanted re­action to the serum. Pee­ling, dry skin often results from overusing harsh products. Stop using the­ serum right away. Prioritize gentle­ moisturizers, avoiding irritating formulas. Allow time for natural healing. Ove­r a few days, your complexion should improve and re­gain balance.

There are many treatments for acne dark spots like chemical peels, laser treatments, certain ointments etc. But I suggest you to first visit a dermatologist in person. Based on your individual condition, the doctor will be able to recommend the best treatment for you. 

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.

Pimples occur when oil and dead skin cells block hair follicles thus leading to a condition called acne. The marks are usually a result of inflammation in the skin. Instances that can be white spots and not consistent in color are marks of hyperpigmentation. Be gentle to your skin, do not pick your skin, and use products with salicylic acid or benzoyl peroxide. 

If you suspect you have a belly button infection, it's important to take appropriate steps.. Clean the area gently with warm water and mild soap. Keep the area dry and avoid excessive moisture. If you notice signs of infection like redness, swelling, pain, discharge, or a foul odor, consider seeking medical advice.