Plain petrolatum based balms have been the gentlest for me, no flavors or menthol. I noticed the tingly mint ones were what made my lips peel in the first place.
Look for something simple with SPF 30 since sun exposure is a common trigger for a fever blister flare. A basic mineral sunscreen balm plus staying hydrated made a big difference for my chapped lips.
Anything with lanolin or shea butter works well for me, and I keep my overall routine steady with sleep, water, and lysine rich foods. If a balm stings or tingles when you apply it, that is usually a sign to skip it.
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