Crabs and their eggs are usually visible to the eye. Sexual transmission is the primary means of transmission, but non-sexual transmission also occurs. Crabs are easily transmitted non-sexually through the sharing of infested bedding or intimate clothing. Contracting crabs from infested toilet seats, couches and chairs is possible but extremely rare. Some crabs are usually visible, no laboratory test is necessary.
Diagnosis is made by a physical exam.
Both the lice and the eggs must be killed. Additional treatment may be necessary if new eggs appear. Any remaining lice are killed by drying these items in a dryer on high heat for 15-20 minutes. Vacuum mattress and bed. Itching may persist even after successful treatment because skin irritation or allergic reactions.