Yes—this is usually a retouching job, though it can be tricky because sweat stains affect both tone/color and fabric texture.

Common approaches:

• Use a masked adjustment layer to brighten and desaturate the stained area so it blends better with the dry fabric. Feather the mask to avoid obvious light or dark edges.
• Curves can work well for this; some editors also paint the correction in selectively with a history brush or similar local adjustment tools.
• For better texture preservation, frequency separation is a strong option: correct the low-frequency tone/color while keeping the high-frequency shirt texture intact.
• In simpler cases, careful painting/cloning can help, especially with a tablet.

Important caveat: fully removing a sweat spot perfectly is hard, because the stain often changes texture as well as color. The goal is usually to make it much less noticeable, not necessarily invisible. If your editor supports it, working in 16-bit color can help reduce banding during heavy tonal/color adjustments.