Oil is bubbling up from my pores.

Even if I keep my skin matte with powder before going to work, oil starts bubbling up from the pores around my T-zone as soon as lunchtime passes. Sebum swells up into white lumps in every pore opening, and when I try to wipe it away by patting on cushion foundation, it gets stuck deep inside, revealing pitted marks that look like pockmarks. I feel like using blotting paper just stretches the pore walls further, so I’m leaning toward Skin Botox, which is said to paralyze the sebaceous glands themselves. I’m wondering if getting it injected densely on the forehead and between the eyebrows really makes the shine and pores more prominent in the afternoon less noticeable. Please let me know how many days it usually takes to feel a reduction in sebum.