Impetigo starts out as a small cluster of blisters that after a few hours breaks into a red, moist area that oozes or weeps fluid. Impetigo appears mainly on the face but also can develop on exposed areas of the arms and legs.
In a few days, there is the formation of a golden or dark-yellow crust resembling grains of brown sugar. The infection may continue to spread at the edges of the infected area or affect other areas of skin.
Tinea versicolor is a fungal infection of the skin. It's also called pityriasis versicolor and is caused by a type of yeast that naturally lives on your skin. When the yeast grows out of control, the skin disease, which appears as a rash, is the result.
The infection can happen for any of the following reasons:
You have oily skin
You live in a hot climate
You sweat a lot
You have a weak immune system
Because the yeast grows naturally on your skin, tinea versicolor is not contagious...
You have sores or a rash that worsens or becomes more uncomfortable. An impetigo infection needs prompt medical attention.
Small, pus-filled sores form, with a dark brown crust. This indicates ecthyma, a deeper form of skin infection that penetrates into the skin. If left untreated, it may cause scarring and permanent changes in skin pigmentation.
NOTE: Sores associated with impetigo may be mistaken for herpes, a viral infection. Impetigo spreads faster and never develops inside the mouth. If in doubt, see a doctor for an accurate diagnosis.