Please do not apply Betnovate GM cream. It contains a strong steroid that can worsen an infection if the bump is an abscess. Your symptoms?a painful bump aggravated by sitting or cycling?strongly suggest a perianal abscess or a thrombosed hemorrhoid. An abscess is a localized infection that typically requires professional medical drainage and oral antibiotics, not topical creams. Applying steroids to an active infection can cause it to spread. I highly recommend consulting a doctor or general surgeon promptly for a proper physical evaluation. For temporary relief, you can try warm sitz baths (sitting in warm water) for 15 minutes, but please avoid self-medicating.