S20.32 - Blister (nonthermal) of front wall of thorax S20.3 - Other and unspecified superficial injuries of front wall of thorax S20.32 - Blister (nonthermal) of front wall of thorax S20.321 - Blister (nonthermal) of right front wall of thorax S20.322 - Blister (nonthermal) of left front wall of thorax S20.329 - Blister (nonthermal) of unspecified front wall of thorax