godan verb (-su), transitive verb
cause to be inflamed; inflame
Rare transitive verb meaning to cause inflammation or soreness, typically of a body part. Mostly found in older or literary texts; modern Japanese usually uses 炎症を起こさせる or similar periphrastic expressions.
傷口をただらかすような薬は使わないでください。
Please do not use medicine that would inflame the wound.
Intransitive counterpart meaning 'to become inflamed/sore'. 爛らかす is the transitive form, but both are rare.
Derived from the rare intransitive verb 爛れる (ただれる, 'to become inflamed') with the transitive suffix かす. The kanji 爛 means 'inflamed' or 'fester'.