If it's about the sensation, you might ask him to try being more tongue-forward than teeth-forward, and to push rather than suck. Pressing really hard with the tongue and swirling it around can feel just as pleasurable for the receiver as a hickey, and the giver can often get the same feeling of primal consumption as gnawing away and sucking provide.
Circus performers and BDSM practitioners often swear by arnica, but it can have drug interactions if taken orally rather than used as a topical ointment, and, since it isn't a medication, quality can vary. You can find a local makeup artist who specializes in special effects (SFX) and ask for a lesson on covering bruises well, but the brutal heat of summer in most areas will almost certainly throw a wrench in that plan.
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