Table 1

Aetiological factors in perianal pruritus

Adapted from Johnson.7
Idiopathic perianal pruritus
Secondary perianal pruritus
  • Dermatological disorders (atopic dermatitis, allergic contact dermatitis, psoriasis, lichen sclerosus, extramammary Paget’s disease, squamous cell carcinoma).

  • Infections

    • – Bacterial (Staphylococcus aureus, group A and B streptococcus).

    • – Intertrigo.

    • – Fungal (candidiasis, dermatophytosis).

    • – Parasitic (Enterobius vermicularis, scabies).

    • – Sexually transmitted diseases (herpes simplex virus infection, syphilis, condyloma accuminata).

  • Local irritants (faecal contamination, sweating).

  • Systemic disorders (diabetes mellitus, lymphoma, psychogenic factors).