“…24 In previous studies, blood levels of topical rapamycin have been lower than the individual laboratory detection limits. 14,15,19,20,22,27,28 Given this, we elected not to measure rapamycin levels in our cases and monitored the patients clinically for any side effects. Topical rapamycin has been reported for use in children as young as 2 years of age, and oral rapamycin has been used in children with vascular anomalies from 21 days of age.…”