Impetigo is a bacterial infection that involves the superficial skin. The most common presentation is yellowish crusts on the face, arms, or legs. The lesions may be painful or itchy, but fever is uncommon.

Impetigo is typically due to either Staphylococcus aureus or Streptococcus pyogenes. With contact it can spread around or between people. In the case of children, it is contagious to their siblings.

Treatment is typically with antibiotic creams such as mupirocin or fusidic acid. Antibiotics by mouth, such as cefalexin, may be used if large areas are affected.

Impetigo affected about 140 million people (2% of the world population) in 2010. It can occur at any age, but is most common in young children. Complications may include cellulitis or poststreptococcal glomerulonephritis.

Treatment ― OTC Drugs
* Because impetigo is an infectious disease, steroid ointments should not be used. If you have trouble distinguishing impetigo lesions from eczemas, please take an OTC antihistamines without using the steroid ointments.
#OTC antihistamine

* Please apply OTC antibiotic ointment to the lesion.
  • A case of impetigo on the chin. Impetigo should be suspected if a small child has no history of injury, but wound-like lesions are spreading.
  • It is presumed to be a secondary infection in patients with atopic dermatitis.
  • Unlike atopic dermatitis, impetigo requires antibiotic treatment and may worsen with the use of steroids.
  • The image shows the appearance after the blisters of bullous impetigo have burst.
  • It can be misdiagnosed as atopic dermatitis.
  • Bullous impetigo ― When accompanied by thin, fragile blisters, it is diagnosed as bullous impetigo.
References Impetigo: Diagnosis and Treatment 25250996
Impetigo, the most common bacterial skin infection in children aged two to five, comes in two main types: nonbullous (70% of cases) and bullous (30% of cases). Nonbullous impetigo is typically caused by Staphylococcus aureus or Streptococcus pyogenes. It's recognized by honey-colored crusts on the face and limbs and mainly targets the skin or can infect insect bites, eczema, or herpetic lesions. Bullous impetigo, caused solely by S. aureus, leads to large, flaccid bullae and often affects areas where skin rubs together. Both types usually clear up within two to three weeks without scarring, and complications are rare, with poststreptococcal glomerulonephritis being the most severe. Treatment involves topical antibiotics (mupirocin, retapamulin, fusidic acid). Oral antibiotics might be necessary for impetigo with large bullae or when topical treatment isn't feasible. While several oral antibiotics (amoxicillin/clavulanate, dicloxacillin, cephalexin, clindamycin, doxycycline, minocycline, trimethoprim/sulfamethoxazole, macrolides) are options, penicillin isn't effective. Topical disinfectants aren't as good as antibiotics and should be avoided. Fusidic acid, mupirocin, retapamulin are effective against methicillin-susceptible S. aureus and streptococcal infections. Clindamycin is useful for suspected methicillin-resistant S. aureus infections. Trimethoprim/sulfamethoxazole works against methicillin-resistant S. aureus, but isn't enough for streptococcal infection.
 Impetigo 28613693 
Impetigo is a common infection of the superficial layers of the epidermis that is highly contagious and most commonly caused by gram-positive bacteria. It most commonly presents as erythematous plaques with a yellow crust and may be itchy or painful. The lesions are highly contagious and spread easily. Impetigo is a disease of children who reside in hot humid climates. The infection may be bullous or nonbullous. The infection typically affects the face but can also occur in any other part of the body that has an abrasion, laceration, insect bite or other trauma. Diagnosis is typically based on the symptoms and clinical manifestations alone. Treatment involves topical and oral antibiotics and symptomatic care.