I'm experiencing issues with penis enlargement and maintaining hardness, which I think might be connected to frequent masturbation. Are there any treatments or solutions for this?

A vertical black line on your thumbnail can be concerning. *Possible Causes* 1. *Vitamin deficiency*: Deficiencies in vitamins like B7 (biotin), B12, or vitamin C can cause nail changes. 2. *Nail trauma*: Injury to the nail bed or nail plate can cause a black line. 3. *Fungal infection*: Fungal infections like onychomycosis can cause nail discoloration. 4. *Melanonychia*: A harmless condition causing a black line or streak on the nail. *What to Do* 1. *Consult a doctor*: Visit a dermatologist or a primary care physician to evaluate the nail change. 2. *Vitamin supplements*: Ensure you're getting adequate vitamins through your diet or supplements. 3. *Nail care*: Keep your nails clean, dry, and moisturized to prevent fungal infections. 4. *Monitor the nail*: Observe the nail for any changes, such as growth or color changes. *When to Seek Immediate Attention* 1. *Pain or discomfort*: If you experience pain or discomfort in your nail or surrounding area. 2. *Bleeding or discharge*: If you notice bleeding or discharge from the nail. 3. *Fever or swelling*: If you have a fever or swelling around the nail.