skin disorders
Cellulitis
Diagnosis of Cellulitis
A doctor's evaluation Sometimes blood and tissue cultures A doctor usually diagnoses cellulitis based on its appearance and the person's symptoms. Laboratory identification of the bacteria from skin, blood, pus, or tissue specimens (called a culture) usually is not necessary unless a person is seriously ill or has a weakened immune system or the infection is not responding to antibiotics. Sometimes, doctors need to do tests to differentiate cellulitis from a blood clot in the deep veins of the leg ( Deep Vein Thrombosis (DVT) ) because the symptoms of these disorders are similar. 