Acne is a very common cause of spots in teenagers; it tends to last for an average of five years, although it can last longer and may persist into adulthood. Acne usually affects the face, back or chest.


Eczema is a long-term, or chronic, condition that causes the skin to become itchy, red, dry and cracked. In some cases the problem area can become infected, making things worse.


Psoriasis affects about 1 in 50 people and men and women suffer in equal amounts. It can start at any age but it’s most usual for first signs to appear at under 35 years old.


Rosacea, which is also sometimes known as acne rosacea, is a skin condition affecting the chin, nose, cheeks and forehead. It normally starts with episodes of flushing, but can progress to permanent redness, spots and visible blood vessels.