The best replacement for bleb is bulla.

The best alternatives to bleb are rated as following:
★★★★★  bulla
★★★  bullae
★  milk blister
★  pneumatocele
  bullous

Your alternative for bleb is not listed? Suggest!
Speaking about bleb, one probably shouldn't forget about pneumothorax.

Other search terms related to bleb and their ratings are:
★★★★★ pneumothorax
★★ spontaneous pneumothorax
You have in mind a companion for bleb and it is not yet here? Propose!



Google Trends

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bleb
bulla
bullae