Dermatology

DERMATOLOGY POINTS

1. HSV — type 1 at mouth, type 2 in genitalia. Recurrent erythema nodosum is characteristic.Dx by Tzank, Tx with acyclovir

2. Herpes zoster (shingles) — dermatomal, reactivated at dorsal nerve root, Tx with acyclovir

3. Varicella (chickenpox) — lesions in all stages of development, Tx with benadryl. In1st TM, causes microcephaly, chorioretinitis, IUGR and cataracts. Treat neonates with VZIG if mom contracted varicella within 5 days of delivery.

4. Impetigo — honey-crusted lesions. S aureus and B-hemolytic strep. Tx with muciprocin

5. Rubella — 3 days of cervical/suboccipital/postauricular node enlargement, prevention best with immunization before 1st TM to prevent triad: visual (cataracts), hearing loss, heart(PDA) defects.

6. Measles (Rubeola)— looks like spilled red paint over your head (rash spread beind ears and over forehead to neck to trunk and extremities), prevent with immunization

7. Roseola — 3-5 days of fever, and THEN rash after (never together). No tx

8. Erythema infectiosum — 5th dz — slapped cheek appearance, parvo B19, causes aplastic crisis in sickle cell patients, no tx

9. Rocky Mountain Spotted Fever — fever, rash on wrists then palms and soles, Dx by weil-felix test, Tx with tetracycline (chloramphenicol if pregnant)

10. Lyme dz — erythema chronicum migrans with central clearing, tx is doxycycline (amoxicillin if pregnant and children <9yo)