What is the best way to reduce weight after having baby by c-section and now breastfeeding too?

Removal & avoidance. If you have developed a delayed (contact) dermatitis to the adhesive or other chemical component in the steristrip, removal and replacement with some other means of closure is optimal treatment. Symptomatic treatment would be topical or if severe enough oral corticosteroids. Patch or delayed hypersensitivity skin testing could be used to try to id the offending chemical(s) for. Future avoidance.