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I have used Ingrow Go on my bikini line after waxing and it's great, but as redwino (and my beautician) say, exfoliation is the most important thing. That helps prevent new ones, but skin lotions help to encourage the existing ones out. They are astringent though, so not good for using over a long period. I found, (this is a bit gross) that after using Ingrow Go for a few days that the ingrown hairs develop "heads" like spots and can be squeezed gently to pop the hair out.
If he doesn't already use an electric razor, I would consider that. Shaving products dry the skin and can make ingrown hairs worse. Unless he's going to wet shave in the traditional way with soap lather (rather than shaving foam) and hot towels and all that, then electric is the way to go.
tendskin is great. But I heard you can make a very reasonable approximation of the stuff by putting a couple of soluble asprin in some glycerine and rosewater and dabbing it on. I shall try that when I run out of my current bottle.
Thank you all. DH does exfoliate but at the mo it hasn't helped. I had heard about tendskin but will have a look at making the little concoction you mention toolly.