Noticed this huge scaly patch on my teen’s back and smaller ones appearing. Worried it’s contagious. Can’t get a referral yet..

1. What That Large Scaly Patch Might Indicate
   One common explanation for a large scaly patch is pityriasis rosea. This condition often begins with a single, prominent spot known as a “herald patch.” It usually measures between 2 and 10 centimeters and often appears on the back, chest, or abdomen. The patch is typically oval or round with a slightly raised, scaly edge.

After this first patch appears, smaller spots may develop across the torso and upper arms, often forming a pattern that resembles a Christmas tree. Although it’s most common in teens and young adults, it can occur at almost any age.

2. Hallmark Signs of Pityriasis Rosea
   Pityriasis rosea usually starts with the herald patch — a pink or reddish oval area with a scaly surface. Within several days to two weeks, smaller patches emerge, typically measuring 0.5 to 2 centimeters wide.
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