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The treatment depends on the diagnosis and the cause of rashes and ring marks. Rashes and ring marks can be caused by a variety of reasons such as eczema, allergy, fungal infections etc. I advise you to take your son to a doctor for knowing the exact cause and diagnosis of rashes and ring marks. Based on that, a proper treatment plan can be recommended. 

Eczema se­ems like your skin issue. It itche­s and has bumps full of fluid on red areas. Eczema ofte­n targets toes, fingers, and thighs. Cause­s include allergies, dryne­ss, and genes. Using mild soap, moisturizing daily, and avoiding harsh chemicals may he­lp manage eczema's symptoms.

The most likely cause is acne or ingrown hair. Accordingly, look for creams with active substances like benzoyl peroxide or salicylic acid to help them go away. These can be found in different brands, including Neutrogena and Clean & Clear. Gently wash your face first, before applying the cream. 

According to me, you can go for a gentle, non-abrasive deep cleansing. Products that contain natural ingredients like tea tree oil, etc. can help with open pores and do not even have side-effects. For preventing dry skin, you can use natural ingredients like aloe vera etc., which can help keep your skin moist. 

Athlete­'s foot, a common fungal skin illness, affects your fee­t. It could cause itchiness, discoloration, pee­ling, and odor. Keeping fee­t clean, dry (especially be­tween toes), he­lps cure it. Use doctor-prescribe­d antifungal creams or powders diligently. We­ar fresh socks, shoes daily. Avoid sharing footwear to pre­vent spreading infection.

If you put salt (NaCl) on a cut it may hurt a bit. The reason for this is that salt is able to kill germs. Therefore if you rub salt in a wound it will only be painful temporarily. If it hurts too much or continues hurting for too long, rinse the area with water. An application of a mild ointment has the ability to protect broken skin.

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.