How long does a chemical burn from nair on the pubic area take to heal? how do you get rid of the pain?

Variable: Sorry to hear about the burn, Louise. If it's a full thickness epidermal burn, it can take 2 weeks to regenerate. For now, I'd recommend either topical aloe vera (as needed) or lidocaine gel (up to every 4 hours), cotton underwear, and avoidance of jeans. The area may stay a bit red or darker for awhile. Laser hair removal may be a good option in the future.

Bikini line?: Usually several days if it is mild. Longer for blistering or erosion of tissue. Options – use washcloth soaked in cold water or even ice water as a compress x 15 minutes. No not apply ice directly to skin. Petroleum based lubricants/ jellies/ lotions (aquaphor ointment, vaseline) or aloe can help to maintain moisture. Hydrocortisone cream 1 % can be applied for significant inflammation.