Final answer:
The 7-year-old with a sandpaper rash after streptococcal pharyngitis likely has scarlet fever, accompanied by symptoms such as fever, sore throat, strawberry tongue, and swollen lymph nodes. Acute rheumatic fever is another possible complication.
Step-by-step explanation:
Symptoms Associated with Scarlet Fever
The 7-year-old child who develops a fine blanching rash, also known as a sandpaper rash, several days after being diagnosed with streptococcal pharyngitis, is likely experiencing scarlet fever. Other symptoms of this condition often include fever, sore throat, inflammation of the pharynx and tonsils, petechiae on the soft or hard palate, and swollen lymph nodes. The skin rash associated with scarlet fever is often followed by a strawberry tongue. Another possible sequela of streptococcal pharyngitis is acute rheumatic fever, which is a more serious condition that can occur 2-3 weeks after an untreated or inadequately treated pharyngitis and may lead to arthritis and carditis, affecting the circulatory system.