I would recommend discarding this bottle and using a new one, especially because you noticed an unidentified black material around the cap. Ulgel-A should be kept tightly closed and stored in a cool, dry place (generally below 25–30°C). The printed expiry date of April 2027 applies to the unopened product under proper storage conditions; it does not guarantee that a bottle remains suitable after opening if there has been possible contamination.

Since your Ulgel-A suspension was opened about 2 months ago and you noticed some black material around the cap, I would advise you to discard the old bottle and purchase a new one as a precaution. Although the expiry date is April 2027, this does not necessarily guarantee that the medicine remains suitable after opening, especially if contamination is suspected. The normal colour and smell of the suspension do not completely rule out contamination. The black material may simply have been dust, but fungal contamination or other impurities cannot be excluded based on your description. Ulgel-A is an antacid preparation, and replacing the bottle is a safer option than taking an unnecessary risk. For future use, keep the bottle tightly closed, store it according to the manufacturer's instructions, and avoid touching the bottle opening with your fingers or other objects. My recommendation is to use a fresh bottle rather than the previously opened one.