An acute staphylococcal infection with blister-like lesions containing millions of virulent bacteria is known as

Impetigo.

Explanation:

Impetigo is the condition caused by bacterial infection and shows yellow crust on the patient's arms, legs and face. Antibiotics are useful in the treatment of impetigo.

Impetigo is caused by the bacteria Staphylococcus aureus. Acute infection with bacteria can cause large blister like lesions in the armpits or groin. These lesion contain millions of virulent bacteria.