Hi Guys i was wiping my mums room and the paint and wall chipped off as i noticed a crack and quite a big air pocket. , how would i go about filling a chip this big its 30cm length and around 25cm width.
what can i use to repair this, the wall solid brick but assume the brown bit is plaster over, apologies i dont know much about DIY, but yeah if anyone could advice what to use to get this back in good shape thanks. the image is below.
Thanks for your help guys.

what can i use to repair this, the wall solid brick but assume the brown bit is plaster over, apologies i dont know much about DIY, but yeah if anyone could advice what to use to get this back in good shape thanks. the image is below.
Thanks for your help guys.

