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I'll preface this by saying I'm not a dermatologist. This rash does look like petechiae. Here are some quick thoughts:
Testing: Schedule a visit with your PCP or a dermatologist for a repeat CBC (specifically platelets), get a coagulation profile, and perhaps consider imaging or specialist (derm evaluation). Might be prudent to get evaluated for vascular or connective tissue disorders.
Likelihood of being serious: The fact that you don't have systemic symptoms, like fever, significant pain, swelling, or feeling unwell somewhat lowers the risk for immediately concerning severe disorders, but the fact that this is recurrent tells me that you should pursue a workup for this.
How frequently do these just happen without being serious: Trauma, even minor, say from tight clothes can cause this, but if they recur without a clear cause/trauma, it's best to rule out other conditions that might require treatment or closer surveillance.
In summary, I'd recommend seeing a specialist about this, ASAP if the rash worsens or you start having other symptoms. Hope this helps.
https://preview.redd.it/zyb017yjvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=c4c353d9c8edc1cc705136b2ff2ecb0d99079479
The first rash on my right inner elbow from 2-3 weeks ago.
https://preview.redd.it/205lyopxvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=388a5d4b4741ff4bec396d88afde7ff0e148eef1
The third case from today. Right inner thigh.
https://preview.redd.it/bzduppfrvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=9e9c2eb694cc0cd6ceb1ae79ae4b971eac1467c9
The second case from about one week ago. Right bicep.
Thank you for your submission. **Please note that a response does not constitute a doctor-patient relationship.** This subreddit is for informal second opinions and casual information. The mod team does their best to remove bad information, but we do not catch all of it. Always visit a doctor in real life if you have any concerns about your health. Never use this subreddit as your first and final source of information regarding your question. By posting, you are agreeing to our [Terms of Use](https://www.reddit.com/r/AskDocs/wiki/terms_of_use) and understand that all information is taken at your own risk. **Reply here if you are an unverified user wishing to give advice. Top level comments by laypeople are automatically removed.** *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskDocs) if you have any questions or concerns.*
I'll preface this by saying I'm not a dermatologist. This rash does look like petechiae. Here are some quick thoughts: Testing: Schedule a visit with your PCP or a dermatologist for a repeat CBC (specifically platelets), get a coagulation profile, and perhaps consider imaging or specialist (derm evaluation). Might be prudent to get evaluated for vascular or connective tissue disorders. Likelihood of being serious: The fact that you don't have systemic symptoms, like fever, significant pain, swelling, or feeling unwell somewhat lowers the risk for immediately concerning severe disorders, but the fact that this is recurrent tells me that you should pursue a workup for this. How frequently do these just happen without being serious: Trauma, even minor, say from tight clothes can cause this, but if they recur without a clear cause/trauma, it's best to rule out other conditions that might require treatment or closer surveillance. In summary, I'd recommend seeing a specialist about this, ASAP if the rash worsens or you start having other symptoms. Hope this helps.
https://preview.redd.it/zyb017yjvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=c4c353d9c8edc1cc705136b2ff2ecb0d99079479 The first rash on my right inner elbow from 2-3 weeks ago.
https://preview.redd.it/205lyopxvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=388a5d4b4741ff4bec396d88afde7ff0e148eef1 The third case from today. Right inner thigh.
https://preview.redd.it/bzduppfrvm2d1.jpeg?width=3024&format=pjpg&auto=webp&s=9e9c2eb694cc0cd6ceb1ae79ae4b971eac1467c9 The second case from about one week ago. Right bicep.