The larger wildfire was reported shortly after 11 a.m. near mile marker 21.67 along San Gabriel Canyon Road in the Angeles National Forest. The other was burning across from the Morris Dam.
The two separate incidents were later dubbed the Gulch 1 Fire and the Gulch 2 Fire.
By around 4 p.m., fire agencies estimated 100 acres had burned.
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Multiple firefighting aircraft responded to the scene, including an air tanker that was dropping Phos-Chek.
No structures were threatened but the flames were burning near some power lines. Angeles National Forest officials were requesting assistance from the California Highway Patrol to evacuate San Gabriel Canyon Road.
Brush fire erupts in San Gabriel Canyon area above Azusa
One firefighter suffered a sprained ankle and was transported to a hospital for treatment. No other injuries were reported.
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The cause of the fire was not immediately known.