I recommend a consultation with a board certified dermatologist for proper diagnosis and treatment.
Scabies, an infestation with a mite, Sarcoptes scabii,
for example, is very itchy, looks like small red bumps with a linear scale (burrow), can spread all over and often involves hands, feet, underarms, waistline, genital area. Burrows can often be seen between the fingers and on the wrists.
Disclaimer: Dr.