These are two fill-in stories. In the first one, Spider-Man gets some chemicals spilled on him that make him less able to beat up street-level thugs, and by the end of the issue, he has recovered. It’s a lot like that issue from the Lee/Ditko days when he got the flu.
In the second, he takes on a villain named Headhunter who literally cuts off the heads of his victims and stores them in jars. A little more gruesome that we’ve come to expect from Spidey stories.
Creators: Stefan Petrucha (plot), Len Kaminski (script), Tom Morgan (pencils) (#26); Dwight Jon Zimmerman, Dave Simons (#27).