The best replacement for induration is erythema.

The best alternatives to induration are rated as following:
★★★★★  erythema
★★★★  fluctuance
★  swelling

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Speaking about induration, one probably shouldn't forget about ppd.

Other search terms related to induration and their ratings are:
★★★★★ ppd
★★★★ tb test
You have in mind a companion for induration and it is not yet here? Propose!



Google Trends

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induration
erythema
fluctuance