If you notice some vein-like structures on your penis glans, those are likely just normal blood vessels that have become more visible. You may notice this more during arousal. Usually, it’s not anything to worry about and doesn’t need treatment. However, if they are causing you pain or discomfort, or if they have appeared suddenly, it would be best for you to see a doctor so they can be evaluated further.

Yes, cysts and papules can be treated with various treatments such as  antibiotics, topical creams, laser treatments and surgery.  I advise you to consult a qualified doctor. Based on proper assessment of your problem, he may be able to suggest the most appropriate treatment for your pimples. 

It seems you're showing some alarming symptoms. The red bumps with black centers may be due to folliculitis (inflamed hair follicles), burn or a mild fungal disorder. The itch on your scrotum is probably caused by possible irritation or it is an allergic reaction. A thorough cleaning of the body and a proper diet would be great as well, but it is the best choice to visit a health care professional to know the correct situation and also get treatment. They have the capability to provide the relevant care and the necessary reassurance. As health should be your priority, always think about getting assistance when you have a problem.

Melasma is a skin condition that can be managed and treated, it may not be completely curable or permanently eradicated.

It could be an infection, swollen lymph nodes, or a cyst. However, the lumps can sometimes be non-cancerous, so it is crucial to get it checked by a healthcare provider just to be on the safe side. They would then suggest the best treatment that is cause-specific. Lumps and other abnormalities it's always better to be safe. 

Herpe­s is a common virus. It causes itchy, painful sores. The­se blisters often appe­ar around your mouth or private parts. You can get it through close contact. He­rpes may seem bad, but doctors can give­ you antiviral medicine. Using protection during se­x helps prevent spre­ading it too. Good hygiene habits are also ke­y. 

Pimples are a result of pore closures on the skin due to the plugs made of oil and dirt. Itching might be a symptom of your skin being inflamed. To relieve the problem, gently clean your skin with a mild cleaner, don't pick or squeeze the pimple, and use a spot treatment with ingredients such as salicylic acid or benzoyl peroxide.

It seems that dandruff might be one of the conditions. The main symptom of dandruff is itching, and white particles of skin can be seen on hair. Sometimes, this condition might also produce red patches on the face, especially around the hairline area. The pathogen fungi on your scalp cause dandruff. For example, choose a shampoo that is specifically designed for dandruff. In particular, washing hair regularly along with the stress management procedure may also be beneficial for you.