Acne is a skin condition that occurs when your hair follicles that block the oil and dead skin cells. It frequently causes whiteheads, blackheads or pimples and usually appears on the face, forehead, chest, upper back and shoulders. Acne is most common among teenagers, though it affects people of all ages. Acne lesions are most common on the face, but they can also occur on the neck, chest, back, shoulders and upper arms.
Both types of clogged pores can develop into swollen, tender inflammations or pimples or deeper lumps or nodules. Nodules associated with severe cases of acne (cystic acne) are firm swellings below the skin’s surface that become inflamed, tender and sometimes infected.

Excess activity of hormone androgens eg., in PCOD & Puberty
High level of estrogen
Excessive oil production
Hair follicles clogged by oil and dead skin cell

Certain medication  Examples include drugs containing corticosteroids, anti-depressant, antacids.

Diet  Studies indicate that certain Dietary factors, including skim milk and carbohydrate-rich foods.

Stress  Stress can make acne worse.

Acne signs and symptoms vary depending on their  condition:

Whiteheads (closed clogged pores)
Blackheads (open clogged pores)
Small red, tender bumps (papules)
Pimples (pustules), which are papules with pus at their tips
Large, solid, painful lumps beneath the surface of the skin called nodules
Painful, pus-filled lumps beneath the surface of the skin called cystic acne

Homeopathy for acne is different From traditional treatment in that a homeopathic remedy is individualized to the person. Because every person is different, there is no single homeopathic remedy that will work for everyone. A remedy is selected based on a person’s unique set of symptoms, Acne is not just a skin disorder, it is also an external expression of an inner imbalance that needs to be resolved at a more profound or constitutional level.