Numular dermatitis
Numular dermatitis (Latin: Nummular dermatitis), also known as eczema nummulare, microbial eczema, discoid eczema, or numular neurodermatitis, is one of many forms of dermatitis. It is characterized by round or oval lesions. The name is derived from the Latin word nummus, meaning money or coin.

Numular dermatitis appears as a delayed inflammatory reaction of skin hypersensitive to microbial antigens and only during periods of impaired skin barrier function. It is probably a reaction to another infection in the body, such as a yeast or streptococcal infection.
Oval, reddened areas of skin with sharply defined edges appear on the skin, often 1-5 cm in size, but sometimes larger. The areas consist of small pimples or blisters. The blisters burst and turn into weeping areas, or, conversely, the lesion becomes extremely dry and flaky. Healing occurs without scarring, sometimes with a slight change in pigmentation.
Treatment of nummular dermatitis depends on the nature of the lesions. It must always include an antimicrobial and anti-inflammatory component. For mild weeping symptoms, baths in a strongly diluted solution (light pink in color) of hypermanganese, 3% boric acid or Jarisch's solution are sufficient. After bathing, the skin should be kept moist and sterile. Apply zinc oil or ichthyol black ointment, for example. Numular dermatitis is treated with corticosteroid ointments prescribed by a doctor.
Dry and flaky patches can be treated with over-the-counter ointments containing anti-inflammatory, moisturizing, and anti-itch ingredients. Prescription ointments containing corticosteroids are more effective. Corticosteroids are not a cause for concern when used in moderation.
Symptoms of irritated skin are often easily confused. If the above treatment is not effective or if the condition recurs after a few weeks, it is necessary to consider changing the diagnosis to a fungal disease, such as tinea corporis, which is transmissible from animals.
Prevention of nummular dermatitis: given that recurrence is common, certain measures must be taken. It is not advisable to wash the skin too often with regular soaps and shower gels, which alter the skin's pH. It is better to use pH-neutral products. It is necessary to avoid contact with irritating and allergenic substances for a longer period of time by using gloves and protective equipment. Modern barrier creams appear to be ideal. Microbes cannot thrive on supple, well-hydrated, and undamaged skin. One such barrier cream is Dermaguard, which protects and moisturizes the skin. Another great feature of Dermaguard is that it is non-greasy, unscented, and does not promote bacterial growth on the skin.
