Hi doc. licked and did a small suck on nipple of a single mother (1-2 licks). am i at risk of hiv? because she showed me on her other nipple that she can produce milk. i have small healing lip cut from accidentally biting myself 1 day before. risk?

No risk, no worry: HIV is not sexually transmitted except by intercourse, never by skin or nipple contact, and never reported in adults by minor contact with milk from lactating women. And in most countries, including the US, the likelihood any particular sexually active woman has HIV is very low. This is nothing to be worried about and no need for HIV test if this is your only potential exposure.