Erythrasma is a harmless bacterial infection in the upper layer of the skin.
This causes a reddish-brown rash in the armpits, under the breast, in the navel or groin. The rash can become cosmetically unsightly and many will then want treatment. Otherwise, the rash usually causes no symptoms, but some report slight itching and a bad smell.
The diagnosis is made either by the doctor perceiving the rash itself as typical of erythrasma and sometimes examining with so-called Wood's light, which is a harmless ultraviolet light in a lamp and a coral-red color (fluorescence) is seen. It is porphyrins (a form of pigment) that the bacteria make that light up in this way. Sometimes the doctor will use a microscope in the office to rule out fungal infection.
Erythrasma can also appear as cracked and swollen skin between the toes and is sometimes mistaken for a fungal infection.
Erythrasma is caused by a skin infection with the bacterium Corynebacterium minitissimum. Such bacteria are part of our normal bacterial flora, but this can flourish on swollen skin or irritated skin and cause local inflammation in the skin. Erythrasma often occurs in healthy adults, but people with pronounced sweating, obesity, diabetes or who are immunocompromised are more susceptible.
Erythrasma is usually treated with antibiotics, either in cream form or in liquid form on the skin areas. In case of insufficient effect or a widespread rash, tablet treatment with antibiotics may be appropriate. It is not unusual for the rash to return. Prevention with antiseptic solution can help. Sometimes there is a simultaneous infection with fungus, which should also be treated.
Our dermatologists help people of all ages, from newborns to the elderly, with everything from simple skin changes to serious conditions.
Our dermatologists help people of all ages, from newborns to the elderly, with everything from simple skin changes to serious conditions.
