Why is my entire body suddenly so itchy?

The causes of the cold abscess might include a bacterial infection but tuberculosis is the other explanation. The signs can be a painless lump, the fever, and sometimes sweating at night. It is vital to get a thorough examination and treatment from a doctor who may prescribe antibiotics for a bacterial infection or TB specific medications if needed.

To understand the severity physical diagnosis is important. Based on that I can recommend treatments like medication, laser treatments or chemical peels etc.

Oily skin is common and can lead to pimples and acne. The symptoms are so shiny skin, big pores, and sometimes breakouts. The cause of oily skin is the excessive sebum production by the skin. Salicylic acid face wash to unclog pores will suffice for this purpose. Oil control is also possible with a serum containing niacinamide. 

You are experiencing seborrheic dermatitis. The condition can be whiteheads, itching, and the loss of eyebrow hair that can particularly be felt on the skin. Skin can develop open pores. It is a result of an overgrowth of yeast on the skin. With the assistance of mild cleansers that don't have any scent at all and dandruff shampoos, they can get rid of the issues of the poor comfort that they have with treatment.

Jellyfish stings are common and can leave scars, swelling, and itching even after the pain subsides. Applying antihistamine creams can help with itching and oral antihistamines are recommended for swelling. If symptoms persist, a local methylprednisolone injection may be considered. It's best to avoid swimming and running until the scars heal to prevent further irritation.

You might be dealing with a common issue called acne. The back can easily get acne due to things like friction from clothes, sweating, or clogged hair follicles. To treat these spots, keep the area clean and dry, wear loose clothing, and use over-the-counter acne treatments with benzoyl peroxide or salicylic acid.

Looks like your daughter has a skin irritation that is contact dermatitis. One common type is contact dermatitis, which is caused by something rubbing against the skin and triggering redness, itching, and swelling. This thing might be her bra strap or shirt, which is the cause of the rash on her skin when it rubs against it while she is playing basketball, To make her feel better, try to use a soothing lotion or cream and let her put on clothes that are not tight enough to prevent rubbing as much as possible.