Persistent symptoms after treatment can be from allergic reaction to mite antigen (after its been killed), in which case itching but no new lesions - or re-infection (new lesions appear)
Physical Exam Findings
Predilection for space between fingers, palms, wrists, elbows, axilla, genitalia, buttocks, areolae, though can be anywhere (rarely face, scalp)
Sometimes burrows visible, but often just closely clustered, 1-2mm red papules and excoriations seen
Treatments
Treatment involves primarily eradicating the mite from the person
Also ridding them from the environment and treating other who are infected (to prevent re-infection)