Case 197. Scabies (20 y-o M)
Multiple itchy papules and vesicles seen on the scrotum
Key words : Sarcoptes scabiei hominis, scabies, mite burrow
sexually transmitted infection
Scabies in the young adult may belong to the sexually transmitted infection. Cleaning and disinfection by hot water are needed for the linen to avoid unnecessary transmission.   Within the cornified layer, a cut surface of Sarcoptes scabiei hominis with the spiked cuticle and immature and mature eggs is observed (HE). The epidermis is moderately acanthotic and the dermis is actively inflamed.
Reference case 197A
Another case of scabies in the aged (68 y-o M). Itchy papules are seen on the interphalangeal area, focally with burrow formation. The mite burrow formation is pathognomonic of scabies. Nosocomial infection of scabies is problematic, particularly in the ward of neurosurgery and in the care stations for the aged.
  Reference case 197A
The female mite, Sarcoptes scabiei hominis, eggs and pigmented feces in the unstained skin scratch preparation after potassium hydroxide treatment. The mite, measuring 0.3-0.45 mm, has four pairs of legs. The mite eats keratinocytes, so that the feces is pigmented by melanosomes and mitochondria.