The morphology and distribution of these lesions is characteristic of ectoparasite bites, which occur when a human carries a pet—usually a kitten or puppy—as if the animal were a human newborn baby.
Ted Rosen, MD
The black, hard center represents an eschar. This type of morphology is almost always caused by a virulent organism—bacterial or fungal. Biopsy showed non-septate hyphae within the dermis, and a culture grew Mucor species (a saprophytic soil fungus).
The multiple erosions on this teenager's lip are most likely an exaggerated version of herpes labialis related to his underlying lymphoma. A viral culture would be useful to verify the diagnosis.
The “rash” of innumerable asymptomatic flat-topped papules on this teenager’s face is highly likely to be flat warts.
This distribution of an inflammatory disorder in a very young child almost always indicates atopic dermatitis. The family history of asthma suggests the atopic diathesis.
The history and lesional morphology are virtually pathognomonic for a dental sinus. Radiographic examination revealed an apical dental abscess that communicated with the skin via a sinus tract.
Erythema and periumbilical swelling led to concern about bacterial infection in a neonate.
This rash arose a week after a 6-year-old boy complained of chills, nausea, and sore throat. WHat's the cause?
This lump on the back of a neonate was noted shortly after birth and had been expanding. What is it?
Poison ivy, oak, or sumac? What is this "itchy rash" that appeared 2 days after the patient cleared some "weeds" from the yard. What should be done about it?